I'm not sure it will bomb, I think day tickets could sell really well based solely on the announced headliners. Chappell, Charli and Post days should sell really well inparticular.
I think it needs a really strong 'final' announcement to boost 3 and six day ticket sales. If it's just DJs then it might struggle.
It's just a bit wishy washy imo. If you want to go to a EDM festival in the region, you will go to untold. They have the big hitters, you wouldn't choose sziget over untold for the lineup.
Likewise would you choose sziget over other mid August festivals that have pukka live acts? Like WOW.
It's just a wishy washy, which doesn't serve many. Which why sales will bomb.